linux-kernel - Re: [f2fs-dev] [PATCH v2 2/2] f2fs: fix infinite loop in __insert_extent

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Message-ID: <1f80bc3f-845f-49f4-93d7-cc1be8a781f5@kernel.org>
Date: Tue, 16 Sep 2025 20:12:27 +0800
From: Chao Yu <chao@...nel.org>
To: wangzijie <wangzijie1@...or.com>, jaegeuk@...nel.org
Cc: chao@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
 linux-kernel@...r.kernel.org, bintian.wang@...or.com, feng.han@...or.com
Subject: Re: [f2fs-dev] [PATCH v2 2/2] f2fs: fix infinite loop in
 __insert_extent_tree()

On 9/15/25 11:52, wangzijie wrote:
> When we get wrong extent info data, and look up extent_node in rb tree,
> it will cause infinite loop (CONFIG_F2FS_CHECK_FS=n). Avoiding this by
> return NULL.
> 
> Signed-off-by: wangzijie <wangzijie1@...or.com>
> ---
>  fs/f2fs/extent_cache.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
> index 199c1e7a8..6ed6f3d1d 100644
> --- a/fs/f2fs/extent_cache.c
> +++ b/fs/f2fs/extent_cache.c
> @@ -605,6 +605,7 @@ static struct extent_node *__insert_extent_tree(struct f2fs_sb_info *sbi,
>  			leftmost = false;
>  		} else {

Need to print some messages here as Jaegeuk suggested, IIUC.

Thanks,

>  			f2fs_bug_on(sbi, 1);
> +			return NULL;
>  		}
>  	}
>